I'm planning on buying an E-flite Ultimate and brushless motor. I'm looking at the Himax and E-flite motors. Both companies have nice solutions for either an outrunner or inrunner. Which is considered best, the inrunner or outrunner? Seems like the inrunner would suffer more from a crash because of the gearbox.

Thanks for any help.

chris

I have both types of motors and I love outrunners a lot more than my geared motor. I have had a few light crashes with my geared motor and I have ended up bending the prop shaft a few times. I've bent a few back into place but I've also purchased a few new ones. I've also crashed the outrunner but havent had any problems with the prop shaft. The geared motors are louder. I never noticed how loud it was until I started flying my outrunner. It runs so smooth and quiet. I like things simple so I think that geared motors add complexity. You have more parts such as pinions, gears and shafts that break and wear.

nupe009,
Could not have said it better!
Outrunners are the only way to fly!

Mike

i think that the only shortcoming of outrunners is that their amp draw is generally slightly higher, and they seem to be
less responsive at lower throttles. i cant explain the last bit, its purely perceptive and from experience.

anybody can qualify?

I've heard that too, and I beleive the answer was the mass of the magnets takes a bit more time to "spool up". They are like the rotary engines of WWI biplanes -- the cylinders actually spin around with the prop.

But it's still plenty of oomph for me and my small foamies. The lack of weight, complexity and noise is much better for the smaller planes.

hehehe! Never heard them called "inrunners" before. LOL!

Both types work fine, just no gears on the outrunner, so it's direct drive. With no gears, theres less stuff rattling around, and less to maintain, clean, and less to go wrong(break). Hope my .02 helps a little.

BTW - Both motors can be geared or direct drive, but if they put out enough power as is to swing the reccomended prop. Gearing an outrunner is, well, just silly.(and a PITA)

Thanks for all of the replies.

You guys are on the right way already, but I thought I should share my experiences too!

Geard are more fragile, true! the gearbox are often a bit more fragile.

You often hear that a gearbox ruin the total eff% which i all wrong! you often have very good efficency on a gearbox, you often loose less then 5%. (othervise the gearbox would melt down) this is nothing I make up, it is the laws of nature, efficency comes with higher RPM, so looking at only the motor it has much higher eff% then an ourtunner, but you need the gearbox to swing a large prop for 3D. as for spoolup, again laws of nature... less mass and the mass is consentrated close to the motorshaft.

For 3D geard inrunners are the only way to go. it responds faster, have more power/weight and swings a larger prop. BUT when it comes to small foamies the diffrance get´s smaller, and the durability, low price and carefree use of outrunners has made them very popular. and you get very good power. it does not matter if you have 2:1 or 3:1 until competition day

Flying deeply gear Hackers I have still not been outrun by any DD or outrunner.

well, hope you get the idea

[link=http://www.electric-airshow.com/video/promotion1.wmv]My 12.3lb Electric Aggressor[/link]

Nice flying Henke!

Your plane has very nice instant thrust out of a hover also.

Thats cos its an "inrunner"!

I like my wee Hacker, goes real well plus i actually thought it was quieter than my Typhoon micro 6.

Angus

Glad to here all this Hipe about outrunners. I will be trying 2 of them out for the 2005 season. Everything I have read and been told outrunners just seam like the NO NONSENSE way to go. Anything to do away with gear drives! I was told the only drawback of outrunners is DO NOT OVERPROP THEM. They can't seem to handle the overheating. this is just what I have been told.

The avarage wattage of an inrunner vs outrunner is about the same but the inrunner can be proped for way higher peak wattage. which is very usable while doing 3D. For sportflying the diffrence seem smaller.

That video was great Henk!! Whats your setup ohh and how much does the plane weights?

it all says on my website.

Hey guys...im totally new on EP flying. I bought E-Flite`s Ultimate 3D also, and have a Ripmax XTRA2829/16 Brushless outrunner motor
Dimensions: 28.8x29mm
NiCad/Ni-MH: 6-10 cells
LiPo: 2-3 cells
Operating: 4-9A
Turns: 16
RPM per Volt: 760
Weight: 57g
Current at Max Effic: 10A/60s
Shaft dia: 3.17mm

could I install it somehow to this aircraft? can and should it go with the included 6:61:1 gearbox or should it go direct?

Thanks!

Sanyul.

That motor will work, but it won't have a lot of pull out from a hover, but adequate. It looks comparable to my Hi-Maxx 2812-0650 even in weight. That's the motor I ran on my Elfite Ultimate. I ended up using a Thunder Power 3S 730mah li-po to reduce weight, it's half the weight of a 1320mah and flight time only decdreaed by like 45 seconds, still about 10-11 minutes per flight. However, flight performance improved big time. Changing the battery dropped the AUW by 1.4oz, or exactly 10% of the weight. Remember lighter flies better especially in 3D.

Anyway unless there is a stick mount for the Ripmax motor you'll have to make your own firewall to mount it on. That's easy to do though using either light ply or a large servo wheel.

I also suggest stiffening the Eflite Ultimate. I added 2 pieces of 2.5" x 3/8" balsa triangle stock to the lower wing and that stopped a lot fo the flex in flight between the wings and fuse and as a result it flew much more precisely and more predictable.

outrunners have one advantage that an 'inrunner' will never have, they can turn extreme RPM and never throw a winding, this makes them the practical choice in EDF setups.

just my $0.02 on it

kc

Personally I find that the simplicity, durability and reduced noise of an outrunner make any minor penalty in performance worth it. I really don't care for gear boxes. They tend to be loud and weak in comparison.

i wonder.. wich one is better for a car..
lets say that we have 2 engines outrunner and inrunner with the same spec
speed no load rpm/V
curent, and maximum curent..
wich one is better for car aplication ?

and why

Outrunners have a great deal more torque while traditional brushless motors can spin up faster. I use outrunners for 3d flight and thraditional for racing planes and pattern flight. That's the difference.